HSK 3
Bǎohù huánjìng shì měi gè rén de yìwù.
Protecting the environment is everyone's duty.
HSK 3
Zhōngguó shíxíng jiǔ nián yìwù jiàoyù.
China implements nine years of compulsory education.
HSK 5
Tāmen shì yìwù láodòng.
They are doing volunteer labor.